Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cf2cd4a1a8a91a7911078b024b4d1083884bc1ca62cc1f1f376781f2ff251b' 
  AND token = 'bTajfEjfxlBT02fraf0ngP9eULEIs6beD0KqLIFbWf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}